Musannaf Ibn Abi Shayba 4:144

'Abd al-Wahhab narrated to us, from Ayyub, from Abu Yazid, from Umm Dharr, who said: I came to 'Aisha. She said: "From where have you come?" I said: "From my brother." She said: "What is his state?" I said: "I bade him farewell, as he intends to depart." She said: "Convey my greeting to him, and command him to stay. For if he were to reach me while I am on some part of the road, I would have stayed." She meant Ramadan.